Non-contact precision pneumatic injection valve

Abstract

A non-contact precision pneumatic injection valve includes a cylinder, a needle disposed inside the cylinder, and an adjustable stroke limiting component. The adjustable stroke limiting component includes a thread-toothed column threadedly engaging an upper end of the cylinder; a spring-limiting column disposed inside and fixedly attached to the thread-toothed column, the spring-limiting column having a first protrusion ring; a spring column axially movably disposed inside the spring-limiting column and having a second protrusion ring, a lower end of the spring column defining a stroke of the needle; and a spring. One end of the spring fixedly engages the first protrusion ring and the other end of the spring fixedly engages the second protrusion so that the spring keeps the spring column at least partially inside the spring-limiting column. The spring biases the lower end of the spring column toward the needle.

Dependencies are inferred from the claim text.